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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Scalable all-fiber coherent beam combination using digital control.

Christian Freier, Samuel Legge, Lyle Roberts

    Applied Optics
    |October 18, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a scalable coherent beam combining system using digital electronic-frequency tagging for high-power fiber lasers. The LOCSET technique enables efficient, cost-effective, and wavelength-agnostic beam combination for advanced laser applications.

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    Area of Science:

    • Optical Engineering
    • Laser Physics
    • Fiber Optics

    Background:

    • Coherent beam combining (CBC) is crucial for scaling laser power.
    • Existing CBC systems face challenges in scalability and cost-effectiveness.
    • Advanced sensing and control are needed for high-performance CBC.

    Purpose of the Study:

    • To demonstrate a filled-aperture coherent beam combining system.
    • To implement a digital sensing and control architecture for CBC.
    • To showcase the scalability and cost-effectiveness of the proposed system.

    Main Methods:

    • Utilized locking of optical coherence via single-detector electronic-frequency tagging (LOCSET).
    • Implemented a field-programmable gate array (FPGA) and electro-optic phase modulators for control.
    • Employed an all-fiber configuration with erbium-doped fiber amplifiers.

    Main Results:

    • Achieved a total stabilized output power of 20 W.
    • Demonstrated a combination efficiency greater than 95%.
    • Obtained an output RMS phase stability of λ/493.

    Conclusions:

    • The LOCSET-based digital control scheme offers a scalable and cost-effective CBC solution.
    • The system is wavelength agnostic and supports a large number of channels.
    • This approach advances high-power fiber laser systems.